A British line of fart-filtering underwear is doing big business, and it has the United States to thank for it.

"Americans are making up the majority of our sales at the moment," Shreddies spokeswoman Ianthe Betts-Clarke told The Huffington Post.

Since word about the odor-neutralizing Shreddies passed through the Internet a few days ago, the company has experienced a 400 percent increase in orders over all, Betts-Clarke estimated.

Shreddies weaves a carbon cloth called Zorflex into its rear panel. Betts-Clarke says it can squash the smell of "200 times the average flatulence emission." (Shreddies apparently hasn't met my Aunt Edna.)

In 2008, the company began to serve customers with digestive-tract woes but branched out. "It's a product for everybody, because everyone farts," Betts-Clarke explained.

Men's boxer briefs cost between $39 and $45, while women's panties are about $31 to $34.